Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

Before Mount Everest was discovered, what was the highest mountain in the world?

I am the beginning of everything, the end of everywhere. I'm the beginning of eternity, the end of time and space. What am I?

The sum of a mother, her baby and her dog's weight is 170 Kg. How much does the baby weigh if the mother weighs 100 kg more than the combined weight of the baby and the dog, and the dog weighs 60 per cent less than the baby?

I shave every day, but my beard stays the same. What am I?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

A mathematics teacher took exams for his students. Out of the total students, 25% passed both the tests included in the exam. However, only 42% were able to clear the first test.

Can you find out the percentage of those students who passed the first test and also passed the second test?

Count the number of balls in picture below:

A man dies of old age on his 25 birthday. How is this possible?

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?